Furnace.



-H. E. 'SMYTHE.

' FURNACE. APPLICATION FILED NOV. 11. 1914.

Patented Dec. 28, 1915.

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FURNACE. 7 APPLICATION FILED NOV; 11,1914.

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WITNESSES INVENTQR H. E SMYTHE.

FURNACE APPLICATION FILED NOV 1 1,1914. 1,165,?25. Patented Dec.28,1915.

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HORACE E. SMYTI-IE, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO THE S. R.SMYTI-IE COMPANY, OF PITTSBURGII, IEENNSYLVANIA, A CORPORATION OF WESTVIRGINIA.

FURNACE.

- specification of Letters Patent:

Application filed November 11, 1914. Serial No. 871,491.

v My invention relates to furnaces. I have illustrated my inventionapplied to a continuous heating furnace designed for the heating ofbillets, slabs, or the like, preparatory to their treatment in rollingmills, but

some features thereof have a wider application.

The objectsof my invention are to pro vide a double pass of the hotwaste gases about the pipes which conduct the air to thecombustionchamber; and to provide check: erwor-k to atomize or-break upthe air so as to admit it to the combustion "chamber at a large numberof places, whereby the fuel gas intimately mixes with the air andinsures a more perfect combustion.

-Other objects are to deflect the burning gas at a number of places inthe, furnace into contact with the metal therein, and to provide meansfor removing from the metal to be rolled the cooled lines produced byits travel on water-cooled pipes in the furnace.

Other objects will appear hereinafter.

Referring to the accompanying drawings, Figure 1 is a longitudinalvertical section through a furnace embodyingthe principles of myinvention; Fig. 2, a horizontal section on the line IIII of Fig. 1; Fig.3, a transverse vertical section on the line III-III of Fig. 1; Fig. 4,a transverse vertical section on the line IVIV of Fig. 1; Fig. 5, a planof a portion of the furnace hearth; and Fig.

6, a detail partly in cross-section and partly I in elevation, showingmeans for reversing the circulation of water in the pipes on which themetal travels in the furnace.

On the drawings, 1 designates the furnace chamber having thereverberatory roof 2 and the hearth or floor 3, The forward por tion 4:of the furnace chamber constitutes the mixing chamberof preliminarycombustion through the pipes 6. The checkerwork I causes the air toenter thefchambere in many fine streams which coverpractically theentire rear end of the chamber. The airv which therefore enters thecombustion chamher in a practically even distribution is intimatelymixed with the fuel gas which it encounters, thereby insuring a largeeconomy in the use of the gas and an increased quantity of heat. I donot limit my invention to the employment of pipes or any definite meansfor'supplying the chamber 4 with gas as 1t can be admitted in manydiflerent ways and at various places.

1 The metal billets 7 are fed from the rear, 01' left hand end of thefurnace (Figs. 1 and stantially horizontal parallel water-cooled pipes8, each pair being preferably asingle pipe having a return bend 9 at itsforward end. I have shown two pairs of pipes 8, but the number of pairsmay be increased or decreased. The pipes 8 terminate at some distancefrom the lateral openings through which the heated billets are removed.On Fig. 1 I have shown one of such openings and have marked it with thenumeral 10. The hearth between the forward ends of the pipes 8 and thedischarge openings 10 is made ofrefractory material having a continuousunbroken surface 11 over which the billets travel after leaving thepipes 8 in order that the uniform heat of the hearth sur- The .roof '2over the rear portion of the chamber 4 is inclined downwardly and towardthe rear of the furnace as shown at 12 to deflect the heat upon themetal on the hearth portion 11. The roof rises farther toward therear asshown at 13. and then descends obliquely toward'the rear at 14 todeflect the'heat upon the billets on the pipes or tracks 8.

The waste gases descend through the lines or openings 15 in the floor atthe rear end of the furnace and then pass forwardly beneath the floor 3through the passages 01 flues 16, separated by the longitudinalpartition 17 'which supports the central portion of the floor 3. Theforward ends of the passages 16 communicate with the upper ends of therecuperator chambers 18. From the latter chambers'the waste gasesdescend to the lower ends of the said chamber and enter the passages orfiues 19 which run to the rear end of the furnace beneath the fines 16and communicate with the stack flue 20.

Patented Dec. 28, 1915. I

2), toward the chamber ion pairs ofsub The. recuperator chambers 18 areeach proacross the pipes.

vided' with a number 'of:. verti cal steel or iron pipes 21 having theirupper ends opening beneath the checkerwork, which islocated in I Y twochambers separated by the vertical partition 22; separating therecuperator chambers also. The lowerends of" the air'pipes 21communicate with the air receiving cham- "bers 23, there being one ofsaid chambers beneath each of the groups of pipes 21. The

- chambers 18 are" gas-tight from'the checker workchambers and. from theair-receiving chambers 23..' .The partition 24 separating the passages16 and 19 is extended forwardly so as to embrace about half of the pipes21,

therebycausing the waste gases\from the passages 16 to pass transverselyacross all the pipes then down along the forward pipes,

and. finally rearwardly across all the pipes,

thus giving the waste gases a double-pass Air is delivered to thechambers 23 through the pipes25, the air being forced by thepfan 26driven by the electric motor 27.

Water is delivered to the pipes-8 hythe supply pipe'28 and taken awaytherefrom.

by the waste pipe 29. Each pair of pipesj 8 is provided with a valve 30having two passages 31' arranged to connect the supply pipe 28 to onemember of the pair and the was'te pipe-to the other member of the' pair,

as shown on Fig. 6. By turning the valves a quarter=revoluti0n theconnections of the supply and waste pipes to the members of eachvpair ofpipes 8 are reversed, so that the water circulation in the pipes 8 maybe reversed to equalize the cooling effect of the water in'the pipes, onthe portions of the billets in contact therewith.

The heat in the two sides of the furnace chamber 1 is regulated by thedampers 31 (Fig. 4) which may he, slid across the passages or fiues 15.

I-claim' 1; In a continuous heating furnace for metal inthe form ofbillets and the like, a

furnace chamber, checkerworkatone end metal in the form of billets andthe like, a

furnace chamber, checkerwork at one end thereof, a passage beneath thechamber for the waste gases, the said passage being connected to thechamber at the remaining end gases beneath the first passage, arecuperator chamber situated beneath the checkerwork, sealed from thecheckerwork and in communication with the adjacent ends of the twopassages, vertical pipes extending through the recuperator chamber,means for feeding air through the pipes into the check erwork, and meansfor causing the gases to hav a double pass across the pipes.

of the latter, a second passage forlwaste S1gned at Pittsburgh, Pa.,this 9th day of November, 191 i.

' o HoRAoE E. SMYTHE.

Witnesses: ALICE DU'.FF, F. N. BARBER.

